Vaccinium Macrocarpon Seed Oil

Vaccinium Macrocarpon (cranberry) seed oil is primarily an emollient/occlusive lipid used in leave-on products typically around ~0.5–10% to support barrier function; as a non-volatile fixed oil it is generally well tolerated. However, like other botanical seed oils it contains minor unsaponifiables and can oxidize, which can increase stinging or trigger dermatitis in a small but real subset of highly reactive or eczematous patients. Given this low-but-nonzero irritation/sensitization potential, it fits best as a generally gentle ingredient rather than exceptionally gentle or inert. Safety Notes: In commercial skincare, cranberry seed oil is often used as a minor emollient/marketing botanical in creams, lotions, and cleansers at trace-to-low levels (~0.05–0.5%), with many leave-on facial moisturizers/serums commonly around 0.5–5% when it is a meaningful part of the oil phase. At the high end, it is also sold directly to consumers as single-ingredient “100% cranberry seed oil” facial oils and as the predominant oil in anhydrous balms/oil serums (typically ~20–90%), so the observed OTC market maximum reaches 100% for neat oil products.